Strings.cpp revision 360784 
1//===- Strings.cpp -------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "lld/Common/Strings.h"
10#include "lld/Common/ErrorHandler.h"
11#include "lld/Common/LLVM.h"
12#include "llvm/Demangle/Demangle.h"
13#include "llvm/Support/GlobPattern.h"
14#include <algorithm>
15#include <mutex>
16#include <vector>
17
18using namespace llvm;
19using namespace lld;
20
21// Returns the demangled C++ symbol name for name.
22std::string lld::demangleItanium(StringRef name) {
23  // itaniumDemangle can be used to demangle strings other than symbol
24  // names which do not necessarily start with "_Z". Name can be
25  // either a C or C++ symbol. Don't call demangle if the name
26  // does not look like a C++ symbol name to avoid getting unexpected
27  // result for a C symbol that happens to match a mangled type name.
28  if (!name.startswith("_Z"))
29    return name;
30
31  return demangle(name);
32}
33
34StringMatcher::StringMatcher(ArrayRef<StringRef> pat) {
35  for (StringRef s : pat) {
36    Expected<GlobPattern> pat = GlobPattern::create(s);
37    if (!pat)
38      error(toString(pat.takeError()));
39    else
40      patterns.push_back(*pat);
41  }
42}
43
44bool StringMatcher::match(StringRef s) const {
45  for (const GlobPattern &pat : patterns)
46    if (pat.match(s))
47      return true;
48  return false;
49}
50
51// Converts a hex string (e.g. "deadbeef") to a vector.
52std::vector<uint8_t> lld::parseHex(StringRef s) {
53  std::vector<uint8_t> hex;
54  while (!s.empty()) {
55    StringRef b = s.substr(0, 2);
56    s = s.substr(2);
57    uint8_t h;
58    if (!to_integer(b, h, 16)) {
59      error("not a hexadecimal value: " + b);
60      return {};
61    }
62    hex.push_back(h);
63  }
64  return hex;
65}
66
67// Returns true if S is valid as a C language identifier.
68bool lld::isValidCIdentifier(StringRef s) {
69  return !s.empty() && (isAlpha(s[0]) || s[0] == '_') &&
70         std::all_of(s.begin() + 1, s.end(),
71                     [](char c) { return c == '_' || isAlnum(c); });
72}
73
74// Write the contents of the a buffer to a file
75void lld::saveBuffer(StringRef buffer, const Twine &path) {
76  std::error_code ec;
77  raw_fd_ostream os(path.str(), ec, sys::fs::OpenFlags::OF_None);
78  if (ec)
79    error("cannot create " + path + ": " + ec.message());
80  os << buffer;
81}
82